Cisco 1841 local network can't access the Internet

I've just (tried to) configured a Cisco 1841 router. It's got two WIC1-ADSL cards but only one is connected currently (ATM0/1/0.1).

I can ping the outside world when at the CLI but can not ping or access the internet from a local machine connected to BVI1.
From the local network I can ping the router (10.100.1.1) and also the outside interface ATM0/1/0.1 (78.86.222.222).

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